Housing grommets for speaker/bell wire

[ACharnley]

There isn't a particular section for this type of question, sorry.

I have an enclosure which will have thin bell wire coming through it and I need a 'grommet' to ensure the drilled round hole that passes the wire has no gaps (due to an epoxy filling process) and also to give the wire some flex protection. I've began a search and I'm really not coming up with any hits, which probably means there's another term for them. Any illumination on the matter would be much appreciated!

 

[KeepItSimpleStupid]

You need better specs than that. I did get some really small ones somewhere. e.g. about the size that you would see coming out of a wall wart.

 

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[rjenkinsgb]

A cable gland with strain relief would give the best combination of sealing and long term flexing life:

https://uk.farnell.com/pro-elec/pelb0250/cable-gland-pa-nbr-3mm-6-5mm-grey/dp/3295847

A plain cable gland is smaller and cheaper

https://uk.farnell.com/pro-elec/pelb0262/cable-gland-pa-nbr-3mm-6-5mm-grey/dp/3295861

You can get classic style rubber grommets with strain relief sleeves, but I can see that filling with epoxy.. It may be OK if you add a bit of self amalgamating tape to the cable and pull that in to the grommet from the inside of the box, to form a flexible plug?

https://uk.farnell.com/hellermanntyton/hv2104-pvc-bk-t1/strain-relief-pvc-hv2104-4-5-6/dp/1827049

This style used to be very common on power cables at one time:

https://uk.farnell.com/richco/srb-r-1/grommet-nylon-6-6-12-7mm-black/dp/3618611

Again, I'd add a turn of SA tape to the cable where it is gripped, to give a flexible seal.

The problem I can see is that anything very short "along" the cable, like a simple grommet, will have a sharp transition from solid material to nothing, so a very short stress area when the cable is moved around.

You could add a length of heatshrink sleeve to the cable where it passes through the enclosure wall and whatever seals it, with a couple of inches outside as a long strain relief.